Unfortunately, looks like serde is not flexible enough to support everything CBOR does,
so a lot of messages cannot be deserialized properly. Other serde-based CBOR libraries
suffer from the same problem.
So now we have a bunch of boring deserialization logic supported by sk-cbor
This isn't a good way to do it though, because opreations processor is only called for each operation,
so we end up not updating the cursor as often as we realistically should be.
I'll refactor this slightly later
Aleksei Voronov